RRB NTPC 2021 PYQs

Question 1

In a frequency distribution, the mid value of a class is 12 and its width is 6. The lower limit of the class is:

Accepted Answer

The lower limit is found by subtracting half the width from the mid value. So, 12 - (6/2) = 12 - 3 = 9.

Question 2

Simplify.‌6.25‌+‌57‌×‌28−534×(15.8−3.4)+5×2.39

Accepted Answer

Apply BODMAS: first solve the bracket (15.8-3.4 = 12.4). Then perform multiplications: 57*28 = 1596, 534*12.4 = 6621.6, 5*2.39 = 11.95. Finally, add and subtract: 6.25 + 1596 - 6621.6 + 11.95 = 1.

Question 3

Which edition of the Indian Premier League (IPL) was played in 2020?

Accepted Answer

The Indian Premier League (IPL) started in 2008. Counting from the inaugural season, the 13th edition was played in the year 2020.

Question 4

Which of the following options defines Operating System?

Accepted Answer

An Operating System (OS) is fundamental software that manages computer hardware and software resources, providing common services for computer programs. Option 2 accurately describes this core function.

Question 5

Find the greatest ratio in the following.

Accepted Answer

Convert each ratio to a decimal or common denominator. 15/28 ≈ 0.535, 5/18 ≈ 0.277, 13/21 ≈ 0.619, 19/27 ≈ 0.703. Comparing these values, 0.703 is the greatest.

Question 6

Select the alphanumeric clusters from among the given options that can replace the question mark (?) in the following series.z1, x4, v9, t16, ?

Accepted Answer

The letters decrease by 2 positions (z-2=x, x-2=v, v-2=t, t-2=r). The numbers are squares of consecutive integers (1^2=1, 2^2=4, 3^2=9, 4^2=16, 5^2=25). Thus, the next term is r25.

Question 7

The sum of the place values of 9 in 96961 is:

Accepted Answer

The first 9 is in the ten thousands place (90000) and the second 9 is in the hundreds place (900). Summing these gives 90000 + 900 = 90900.

Question 8

Who among the following received the Padma Vibhushan for the year 2020?

Accepted Answer

George Fernandes was posthumously awarded the Padma Vibhushan in 2020 for his distinguished service in public affairs. This is a direct factual recall question.

Question 9

Select the number from among the given options that can replace the question mark (?) in the following series.64, 60, 52, 40, ?, 4

Accepted Answer

The series follows a pattern where the difference between consecutive numbers increases by 4. The differences are -4, -8, -12. So, the next difference should be -16. 40 - 16 = 24.

Question 10

The Buland Darwaza at Fatehpur Sikri was erected by Akbar to celebrate his conquest of ______.

Accepted Answer

The Buland Darwaza was built by Emperor Akbar in 1601 AD to commemorate his victory over Gujarat in 1573 AD. It is a significant architectural marvel.

Question 11

The exterior angles of any polygon sum up to:

Accepted Answer

The sum of the exterior angles of any convex polygon, regardless of the number of sides, is always 360 degrees. This is a fundamental property.

Question 12

What is the code name of India’s first successful Nuclear test?

Accepted Answer

India's first successful nuclear test, conducted on May 18, 1974, was codenamed 'Smiling Buddha'. It marked a significant milestone in India's nuclear program.

Question 13

From which constituencies did Congress leader Rahul Gandhi contest the Lok Sabha Elections of 2019?

Accepted Answer

Rahul Gandhi contested the 2019 Lok Sabha Elections from Amethi (Uttar Pradesh) and Wayanad (Kerala). He won from Wayanad but lost in Amethi.

Question 14

A company sold six different cars Swift, Santro, Creta, Audi, I10 and Magna during a period of Monday to Saturday. Only one car was sold on a particular day. No car was sold twice. Atleast four cars were sold after the car Santro. The car Magna was sold on Tuesday. The car Audi was sold immediately after the car Creta and car Creta was sold atleast before three cars. Both the cars Santro and I10 were sold atleast before one car. On which day was Swift car sold?

Accepted Answer

Magna is Tuesday. Santro has at least 4 cars after it, so Santro is Monday. Creta is before at least 3 cars, and Audi is immediately after Creta. This places Creta-Audi as Wednesday-Thursday. I10 is before at least one car. The remaining car Swift is sold on Saturday.

Question 15

If a man travels from A to B at a speed of 50 km/h and returns by increasing his speed by 40%, then find his average speed (to 2 decimal places) for both the trips.

Accepted Answer

Calculate the return speed (50 * 1.4 = 70 km/h). Use the average speed formula: 2xy / (x+y) = 2 * 50 * 70 / (50+70) = 7000 / 120 = 58.33 km/h.

Question 16

Select the number from the given options, which has a characteristic common with the following numbers.29, 43, 59, 53, 89

Accepted Answer

All given numbers (29, 43, 59, 53, 89) are prime numbers. Among the options, only 79 is a prime number, making it the correct choice.

Question 17

Human growth hormone is secreted by which gland?

Accepted Answer

Human growth hormone (HGH) is primarily secreted by the somatotroph cells located in the anterior lobe of the pituitary gland, which regulates growth and metabolism.

Question 18

Albert Einstein was awarded the Nobel Prize for ______ in 1921.

Accepted Answer

Albert Einstein received the Nobel Prize in Physics in 1921 for his discovery of the law of the photoelectric effect, not for his theory of relativity.

Question 19

The value of‌(0.27)2−(0.13)20.27+0.13is:

Accepted Answer

Use the identity a² - b² = (a - b)(a + b). The expression simplifies to (0.27 - 0.13)(0.27 + 0.13) / (0.27 + 0.13), which further simplifies to 0.27 - 0.13 = 0.14.

Question 20

When was Project Tiger launched in India?

Accepted Answer

Project Tiger, a wildlife conservation initiative, was launched in India on April 1, 1973, to protect the Bengal tiger.